Speaker



FIG. 1 is a perspective view thereof looking from the upper right-side direction of a speaker;

FIG. 2 is a front view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a speaker, as shown. 